Optimization Study of Seismic Design Parameters for Anti-Slide Piles in the Shenjiabao Slope Beichuan
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摘要: 本文以北川王家岩南侧沈家包抗滑桩加固工程为背景，通过现场低应变测试、混凝土强度测试、FLAC 3D数值模拟及拟静力理论计算，系统研究了强震作用下抗滑桩加固边坡的动力响应规律。结果表明，随输入地震动强度增大，PGA放大系数呈非线性衰减特征，抗滑桩可以显著抑制边坡动力放大效应，其阻滑能力随地震动峰值增强而提升，地震作用下桩顶位移9.78 cm满足规范容许限值；抗滑桩内力分布特征显示，桩身剪力与弯矩峰值位于滑面附近；参数敏感性分析表明，桩长16 m、间距6.75 m为最优抗震设计参数；拟静力法计算得出桩身峰值剪力与峰值弯矩较数值模拟分别偏小2.93%和5.87%，建议抗震设计安全系数取1.2以上；研究揭示了抗滑桩在强震作用下的动力响应机理，为高烈度区边坡抗震设计提供了理论与技术支撑。Abstract: This article, using the Shenjiabao landslide stabilization project with anti-slide piles on the south side of Wangjiayan in Beichuan as a case study, employs field low-strain testing, concrete strength testing, numerical simulation via FLAC 3D, and pseudo-static theoretical calculations to systematically investigate the dynamic response characteristics of slope stabilization by anti-slide piles under strong earthquake conditions. Key findings include:With an increase in the intensity of input seismic motion, the PGA amplification factor exhibits a nonlinear decay characteristic. Anti-slide piles can significantly suppress the slope's dynamic amplification effect, with their resistance to sliding increasing as the peak ground acceleration increases. Under seismic action, the top displacement of the pile was 9.78 cm, meeting the permissible limits specified by standards; The internal force distribution characteristics of the anti-slide piles show that the peak shear force and bending moment are located near the sliding surface; Parametric sensitivity analysis indicates that the optimal seismic design parameters are a pile length of 16 m and a spacing of 6.75 m; The pseudo-static method calculates that the peak shear force and peak bending moment of the pile body are 2.93% and 5.87% lower, respectively, than those obtained from numerical simulations. It is recommended that a safety factor of at least 1.2 be adopted for seismic design; This study reveals the dynamic response mechanism of anti-slide piles under strong earthquakes, providing both theoretical and technical support for the seismic design of slopes in high-intensity seismic zones.
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图 9 汶川地震卧龙强震台加速度时程曲线
Figure 9. Acceleration time history curve of Wenchuan earthquake recorded at Wolong strong motion station
图 18 不同桩长坡面位移对比
Figure 18. Comparison diagram of slope surface displacement for different pile lengths
图 19 不同桩长的桩顶位移变化
Figure 19. Variation diagram of pile top displacement for different pile lengths
图 20 不同桩长的桩身剪力对比
Figure 20. Comparison diagram of pile body shear force for different pile lengths
图 21 不同桩长的桩身弯矩对比
Figure 21. Comparison diagram of pile body bending moment for different pile lengths
图 22 不同桩间距坡面位移对比
Figure 22. Comparison diagram of slope surface displacement for different pile spacings
图 23 不同桩间距桩身位移对比
Figure 23. Comparison diagram of pile body displacement for different pile spacings
图 24 不同桩间距的桩身剪力对比
Figure 24. Comparison diagram of pile body shear force for different pile spacings
图 25 不同桩间距的桩身弯矩对比
Figure 25. Comparison diagram of pile body bending moment for different pile spacings
表 1 数值模拟相关参数
Table 1. Parameters for Numerical Simulation
材料 密度/
（kg·m−3）弹性模量/
MPa黏聚力/
kPa摩擦角/
（°）泊松比 滑体 2300 37 42 38.06 0.3 基岩 2500 35000 2210 64.63 0.2 接触面 — — 30 25 — 抗滑桩 2600 30000 — — 0.2 
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陈昌富,肖淑君,2009. 基于加权残值法和统一强度理论抗滑桩合理锚固深度的确定方法. 工业建筑,39(1):85−89.Chen C. F., Xiao S. J., 2009. Determination method of the rational anchorage length of anti-slide pile based on unified strength theory and weighted residual method. Industrial Construction, 39(1): 85−89. (in Chinese) 褚思文,2016. 应变反射波法的桩基完整性检测技术与应用研究. 合肥:安徽建筑大学.Chu S. W., 2016. The research of integrated testing and application of low strain reflected wave method. Hefei:Anhui Jianzhu University. (in Chinese) 崔芳鹏,许强,谭儒蛟等,2011. 地震动力作用触发的斜坡崩滑效应模拟. 同济大学学报(自然科学版),39(3):445−450.Cui F. P., Xu Q., Tan R. J., et al., 2011. Numerical simulation of collapsing and sliding response of slope triggered by seismic dynamic action. Journal of Tongji University (Natural Science), 39(3): 445−450. (in Chinese) 戴自航,张晓咏,邹盛堂等,2010. 现场模拟水平分布式滑坡推力的抗滑桩试验研究. 岩土工程学报,32(10):1513−1518.Dai Z. H., Zhang X. Y., Zou S. T., et al., 2010. Field modeling of laterally distributed landslide thrusts over anti-slide piles. Chinese Journal of Geotechnical Engineering, 32(10): 1513−1518. (in Chinese) 邓东平,李亮,罗伟,2012. 地震荷载作用下土钉支护边坡稳定性拟静力分析. 岩土力学,33(6):1787−1794. doi: 10.3969/j.issn.1000-7598.2012.06.029Deng D. P., Li L., Luo W., 2012. Stability analysis of slope protected by soil nailing under earthquake loads based on pseudo static method. Rock and Soil Mechanics, 33(6): 1787−1794. (in Chinese) doi: 10.3969/j.issn.1000-7598.2012.06.029 董金玉,杨国香,杨继红等,2011. 汶川地震灾区滑坡的成因及典型实例分析. 华北水利水电学院学报,32(5):10−13.Dong J. Y., Yang G. X., Yang J. H., et al., 2011. Analysis of causes and typical examples of the landslide in Wenchuan earthquake disaster area. Journal of North China Institute of Water Conservancy and Hydroelectric Power, 32(5): 10−13. (in Chinese) 范方方,李健,叶茂等,2021. 地震作用下三维抗滑桩加固土质边坡稳定性分析. 防灾减灾工程学报,41(2):394−402.Fan F. F., Li J., Ye M., et al., 2021. Three dimensional seismic stability of earth slopes reinforced with piles. Journal of Disaster Prevention and Mitigation Engineering, 41(2): 394−402. (in Chinese) 黄诚,任伟中,2012. 抗滑桩与滑坡相互作用分析的常微分方程组边值法. 计算力学学报,29(23):421−426.Huang C., Ren W. Z., 2012. Boundary value method of ordinary differential equation system for analysing interaction between landslide and stabilizing pile. Chinese Journal of Computational Mechanics, 29(23): 421−426. (in Chinese) 姜彤,雷家华,王润泽等,2019. 抗滑桩不同布桩方式加固效果对比模型试验研究. 应用基础与工程科学学报,27(2):404−417.Jiang T., Lei J. H., Wang R. Z., et al., 2019. Comparative model test study on reinforcement effect of anti-slide pile with different arrangements. Journal of Basic Science and Engineering, 27(2): 404−417. (in Chinese) 金林,胡新丽,谭福林等,2016. 基于红外热成像技术的抗滑桩土拱效应模型试验研究. 岩土力学,37(8):2332−2340.Jin L., Hu X. L., Tan F. L., et al., 2016. Model test of soil arching effect of anti-slide piles based on infrared thermal imaging technology. Rock and Soil Mechanics, 37(8): 2332−2340. (in Chinese) 罗资清,2020. 基于FLAC3D的边坡稳定性及抗滑桩加固处理分析. 西部交通科技,(3):46−49,132. 牌立芳,吴红刚,杨涛,2018. 高填方滑坡抗滑桩地震动力响应分析. 中国地质灾害与防治学报,29(5):126−134.Pai L. F., Wu H. G., Yang T., 2018. Seismic dynamic response analysis of anti-slide piles supporting the high fill landslide. The Chinese Journal of Geological Hazard and Control, 29(5): 126−134. (in Chinese) 祁生文,伍法权,严福章等,2007. 岩质边坡动力反应分析. 北京:科学出版社,66−70.Qi S. W. , Wu F. Q. , Yan F. Z. , et al. , 2007. Rock slope dynamic response analysis. Beijing: Science Press, 66−70. (in Chinese) 饶国涛,2020. 归州老城滑坡稳定性分析及抗滑桩加固模拟. 宜昌:三峡大学.Rao G. T., 2020. Stability analysis of Guizhou old city landslide and simulation of anti-slide pile reinforcement. Yichang:China Three Gorges University. (in Chinese) 石中林,朱宏平,徐建军,2013. 地基基础检测. 武汉:华中科技大学出版社,56−75. 王学伍,2019. 地震作用下顺层岩质边坡动力响应规律及其破坏机制. 大连:大连理工大学.Wang X. W., 2019. Dynamic response law and failure mechanism of bedding rock slope under earthquake. Dalian:Dalian University of Technology. (in Chinese) 武冬停,2022. 抗滑桩加固边坡抗震稳定性分析. 中国公路,(22):100−103. doi: 10.3969/j.issn.1006-3897.2022.22.025 许强,裴向军,黄润秋等,2009. 汶川地震大型滑坡研究. 北京:科学出版社,174−186.Xu Q. , Pei X. J. , Huang R. Q. , et al. , 2009. Large-scale landslides induced by the Wenchuan earthquake. Beijing: Science Press, 174−186. (in Chinese) 杨建中,2011. 低应变反射波法基桩完整性检测应用研究. 郑州:郑州大学.Yang J. Z., 2011. Applied research on testing of pile integrity by low strain reflection wave method. Zhengzhou:Zhengzhou University. (in Chinese) 殷跃平,潘桂棠,刘宇平等,2009. 汶川地震地质与滑坡灾害概论. 北京:地质出版社,81−100.Yin Y. P. , Pan G. T. , Liu Y. P. , et al. , 2009. Great Wenchuan earthquake: seismogeology and landslide hazards. Beijing: Geological Publishing House, 81−100. (in Chinese) 赵晓彦,胡凯,梁瑶等,2018. 王家岩滑坡锁固段剪切震动触发启程剧动试验. 岩石力学与工程学报,37(1):104−111.Zhao X. Y., Hu K., Liang Y., et al., 2018. Experiment on sudden departure triggered by shearing vibration for locked segment of Wangjiayan landslide. Chinese Journal of Rock Mechanics and Engineering, 37(1): 104−111. (in Chinese) 赵子豪,张海旭,杜威等,2025. 考虑桩间土拱效应的抗滑桩加固边坡稳定性分析. 济南大学学报(自然科学版),39(1):78−86,98.Zhao Z. H., Zhang H. X., Du W., et al., 2025. Stability analysis on slopes reinforced by using anti-slide piles considering soil arching effect between piles. Journal of University of Jinan (Science and Technology), 39(1): 78−86,98. (in Chinese) 周德培,张建经,汤涌,2010. 汶川地震中道路边坡工程震害分析. 岩石力学与工程学报,29(3):565−576.Zhou D. P., Zhang J. J., Tang Y., 2010. Seismic damage analysis of road slopes in Wenchuan earthquake. Chinese Journal of Rock Mechanics and Engineering, 29(3): 565−576. (in Chinese) He Y., Hazarika H., Yasufuku N., et al., 2015. Three-dimensional limit analysis of seismic displacement of slope reinforced with piles. Soil Dynamics and Earthquake Engineering, 77: 446−452. doi: 10.1016/j.soildyn.2015.06.015 You C., Xing H. F., 2020. Study on the structure optimization of h-type anti-slide pile. IOP Conference Series: Earth and Environmental Science, 455: 012020. doi: 10.1088/1755-1315/455/1/012020 Zhang Q., Hu J., Du Y. L., et al., 2021. A laboratory and field-monitoring experiment on the ability of anti-slide piles to prevent buckling failures in bedding slopes. Environmental Earth Sciences, 80(2): 44. doi: 10.1007/s12665-020-09288-6 -
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